The summer fog usually begins at or near the surface , working gradually upward , though to an observer on the ground it seems to materialize rather suddenly out of nothing more tangible than a few stray wisps of vapor . The maximum height of the fog depends on many aerological factors , but it is seldom more than a few hundred feet . Temperature in the fog layer usually decreases with altitude at something like the moist adiabatic rate (-2 /1000 ft and just...











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